A SEMINAR REPORT ON ASYNCHRONOUS TRANSFER MODE(ATM) Under the Guidance of Mr R.K.Shial By

Technical Seminar

Presented by :- Sangram Sekhar Choudhuri(CS200118218) 1

ASEMINAR REPORT ON

ASYNCHRONOUS TRANSFER MODE(ATM)

Under the Guidance ofMr R.K.Shial

By

Sangram Sekhar ChoudhuriCS200118218

Technical Seminar


INTRODUCTION• High performance, cell-oriented switching and

multiplexing technology

• Utilizes fixed-length packets to carry different types of traffic

• Helps in efficient multimedia applications, high-speed LAN connections and used in broad range of networking devices

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OVERVIEW

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BENEFITS OF ATM

• high performance via hardware switching• dynamic bandwidth for bursty traffic • class-of-service support for multimedia • scalability in speed and network size • common LAN/WAN architecture • opportunities for simplification via VC

architecture • international standards compliance

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ATM CELL HEADER FORMAT

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ATM REFERENCE MODEL

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ATM ADDRESS FORMAT

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ATM SERVICE CLASSES

• constant bit rate (CBR)

• variable bit rate–non-real time (VBR–NRT)

• variable bit rate–real time (VBR–RT)

• available bit rate (ABR)

• unspecified bit rate (UBR)

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ATM TECHNICAL PARAMETERS

• cell loss ratio (CLR) • cell transfer delay (CTD) • cell delay variation (CDV) • peak cell rate (PCR) • burst tolerance (BT) • sustained cell rate (SCR)

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ATM STANDARDS• A cohesive set of specifications that provide a

stable ATM framework.• Provide the end-to-end service definitions • An important ATM standard is interworking

between ATM and frame relay • Two ATM networking standards

1)broadband intercarrier interface (B–ICI) 2)public network-to-network interface (P–NNI)

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DATA INSERTION SCHEMES

• RFC1483-specifies how interrouter traffic is encapsulated into ATM

• LANEMPOA- support dynamic use of ATM SVCs

• voice and video adaptation schemes-for efficient traffic that no natural breaks, such as a circuit carrying bits at a fixed rate

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ATM LAN EMULATION(LANE)• LANE components

1)LANE clients

2)LANE servers

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VIDEO OVER ATM• Handled by VBR–RT VCs using AAL–5 for

MPEG2 on ATM for video-on-demand applications

• MPEG2 coding can result in two modes: 1. program streams—variable-length packets

carrying single or multiple programs 2. transport streams—188-byte packets that

contain multiple programs • Time stamps are inserted into MPEG2 packets

during the encoding and multiplexing process to make better use of networking resources.

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VOICE OVER ATM

• VBR–RT connections is used over ATM which uses silence period.

• Various dynamic compression techniques are used to free bandwidth and alleviate congestion

• A further enhancement is to support voice switching over SVCs which interprets PBX (private branch exchange) signaling and routing voice calls to the appropriate destination PBX

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NETWORK TRAFFIC MANAGEMENT• objectives :To deliver quality-of-service (QoS)

for multimedia applications and provide overall optimization of network resources.

• categorized into three distinct elements

1. nodal-level controls that operate in real time

2. network-level controls operate in near real time

3. network engineering capabilities operating in non real time

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ATM APPLICATIONS

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ATM AND IP INTERWORKING• ATM and IP offer: Scalability, traffic engineering,

service differentiation, high availability, value-added applications such as Virtual Private Networks (VPNs)

• Some specifications of ATM and IP

1. Multi-Protocol over ATM (MPOA) as addition to LAN Emulation (LANE)

2. Additions to ATM's superior routing protocol PNNI

3. adoption of Frame-based ATM over Sonet/SDH (FAST)

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CONCLUSION• ATM technology is the only technology that can

guarantee a certain and predefined quality of service.

• The growth of the Internet, need for broadband access and e-commerce are spurring the need for a reliable, flexible, scalable, predictable, versatile transport system and that is given by ATM Technology.

• For voice, video, data and images together, the next generation network depends on ATM.

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A SEMINAR REPORT ON ASYNCHRONOUS TRANSFER MODE(ATM) Under the Guidance of Mr R.K.Shial By

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